DP 6.0 - Ultrium LTO 1 tapes will not format to 200GB

We are now running Data Protector 6.0 on variouls Win2000/2003 servers. We have previously used v5.10 and v5.50. We have Ultrium 1 tapes that we normally format to 200GB and have had no issues until v6.0 now tapes are showing up total formatted capacity of between 84GB and 94GB, when forced reformatted again with 200GB (204800) specified, they come up to 100GB (102400). Other tapes are showing 125GB to 147GB total capacity, but cannot reformat those tapes at this time. This has not been an issue with the same tapes and previous versions of Data Protector.